SQL，按計數選擇組，最大列數

Question

我們有以下SQL。 按product_id分組並計數。 限制6.下面的查詢和示例輸出。

現在，假設我想要Group by product_id and count. Limit 6. Group by product_id and count. Limit 6.是基於表中的最后1000條記錄嗎？ 因此，不是整個表，而是僅基於最近1000條記錄的組/計數。 能做到嗎？

我已經在使用LIMIT來排名前6位。但是，有沒有一種方法來限制獲得count.grouping為MAX的列數呢？

希望這很清楚

thx，肖恩

SELECT `t`.`product_id` AS `id`, COUNT(*) AS `cnt` 
FROM `sofreport_viewed_product_index` AS `t` WHERE (t.product_id != '24') 
AND (t.store_id = '1') GROUP BY `t`.`product_id` ORDER BY `cnt` DESC LIMIT 6

---

id  cnt
9   239
440 179
216 169
10  157
494 126
500 118

Answer 1

我認為它會那樣工作，

SELECT `t`.`product_id` AS `id`, COUNT(*) AS `cnt` FROM
`sofreport_viewed_product_index` AS `t` WHERE (t.product_id != '24')
 AND (t.store_id = '1') and t.product_id in
(SELECT id FROM sofreport_viewed_product_index ORDER BY ‘cnt‘ LIMIT 1000 )
GROUP BY `t`.`product_id` ORDER BY `cnt` DESC LIMIT 6